Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-01-24
Astronomy and Astrophysics
Astrophysics
6 pages, invited talk at STScI ASP Conf. Series "Blazar Demographics" conf. proc. ed. P. Padovani & C.M. Urry
Scientific paper
I describe two difficulties with current research into the cosmic evolution
of BL Lacertae Objects: (1). Possible sample incompleteness due to unrecognized
(i.e., ``hidden'') BL Lacs; and (2). The absence of a viable physical model of
the evolution, to which current and future observations can be compared.
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